About this replacement
Kimo 6 Inch Cordless Chainsaw — 20V Li-ion Replacement Battery (K16811)
This is a 20V Li-ion battery rated at 1500mAh (30Wh), built to the K16811 specification. It fits the Kimo 6 Inch Cordless Chainsaw and compatible models including QM-6001, QM-T20, and QM-3061B. When the original pack loses charge capacity or fails to hold voltage under load, this is the direct swap.
- QM-series platform compatibility: The QM-6001, QM-T20, QM-3061B, and related Kimo chainsaws share the same 20V battery rail, connector pinout, and BMS handshake protocol — which is why one pack covers the full lineup.
- Bench tested on actual hardware: We ran this pack through full charge-discharge cycles on a 20V motor load and confirmed the BMS engages overcurrent protection correctly on inrush spikes, holds the voltage rail stable mid-cut, and terminates charge cleanly at 21V.
- First-use motor profiling: Run the chainsaw at half load for two cycles before tackling maximum-diameter cuts. This lets the BMS log the motor's inrush current signature and calibrate overcurrent thresholds before you push it hard.
BMS cutoff on chainsaw motor-start inrush surge
When you pull the trigger on a brushed or brushless chainsaw motor, the initial inrush current spike can be two to four times the running current. A new battery straight from storage has a cold BMS with no inrush profile stored — it may read that spike as a fault and cut the output immediately. Running two half-load cycles first lets the BMS distinguish a normal start surge from a true overcurrent event. After those cycles, the pack handles full-speed trigger pulls without tripping.
Charger blinking red on this pack after storage
Li-ion cells stored for several months can self-discharge below the charger's acceptance voltage — typically under 2.5V per cell. Most Kimo chargers refuse to begin a full charge cycle on a pack reading below that threshold, so the LED blinks red and nothing happens. Place the battery on the charger, wait 10–15 minutes, then remove and re-seat it — some chargers run a trickle pre-charge pulse that brings the cells up to acceptance voltage on that first contact. If the charger still rejects the pack after two attempts, check cell voltage directly; anything above 2.5V per cell (10V total on a 4S pack) should begin charging normally.